Or you could do like a bunch of tests. Like, test of strength, test of wisdom, test of intelligence, test of speed, test of fashion sense, so on. Whoever wins the most wins!

OR! Have the families/friends of the 2 people getting married face each other in some sort of team game. Like Soccer or Football or dodgeball (yes). Winning team gets to chose, each person getting married is Captain on their own team. It's like a new family bonding experience!